On Wednesday, 07/01/2015 at 07:56 EDT, "Morris, Kevin J. (RET-DAY)" <kevin.mor...@reedelsevier.com> wrote: > I know that we will lose the capability to overcommit/share memory between > zLinux systems, but the application running in this environment is very > response-time critical/sensitive so we actually dedicated memory resources to > our production zLinux systems anyways. Additionally, after retiring the ~12 > servers, we now have a memory excess on all of our zVM LPARs. > VSWITCH is nice with its automatic failover, etc; however, we have tested the > linux "bonding driver" and feel it is an adequate replacement. We are not a > zVM SSI user.
The VSWITCH also provides the security controls to keep a guest from VLAN hopping. (Assume Linux has been hacked.) As long as you have compensating controls, removing the VSWITCH shouldn't pose any obstacle. > Given our static environment, can anyone provide any glaringly obvious > caveats/downfalls to migrating from zVM to standalone zLinux LPARs that we > might be missing? As long as you remove all z/VM dependencies from the guests (mindisks, VDISKS, DIAG250 driver, EDEVs, DR, etc.) before you migrate them to their own LPARs, then you should be fine. For example, minidisks allowed the virtual machines to share an I/O configuration. Your IOCDS will need to be changed to create limited I/O configurations for each LPAR. Speaking of IOCDS, how do you plan to manage it? Standalone IOCP? Or is z/OS on these boxes, too? Alan Altmark Senior Managing z/VM and Linux Consultant Lab Services System z Delivery Practice IBM Systems & Technology Group ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
